Pumping mechanism



Patented `lune 5., 1928.A

UNITED sTATEs PATENT OFFICE.

CLAYTON A. D'U'NHAM, OF' GLENCOE,` ILLINOIS,A`SSIGNOR TO C. A. DUNHAM COM- PANY, 0F MARSHALLTOWN, IOWA, A CORPORATION OF IOWA.

PUMPING MECHANISM.

Application ld November 28, 1921. Serial No. 518,386.

means of a pump and certain conduits con' nected therewith, a. forced circulation of water which is caused to pass at a high velocity through a jet eXhauster for the purpose of drawing condensate, vapor and gases from the radiating system into the circulatory conduit and forcing water from sai'd circulatory conduit into the boiler. It is one of the objects of the invention to provide in a pumping mechanism of this sort,

means for equalizing the fluid pressures on opposite sides of the pump whereby theaction of the pump is not affected by fluctuation in boiler pressure and the lpumping mechanism does not have to overcome boiler pressure in introducing the feed water into the boiler. i

A further object is to provide for discharging from the water circulatory conduit the air or other" gases drawn into the same by the jet exhauster.

The invention consists of the new and improved constructions, arrangements and devices, to be hereinafter described and claimed, for carrying out the above stated objects and such other incidental objects as will be referred to in connection with the following description of the preferred form of the invention disclosed in the accom- Apanying drawing. While the improved pumping mechanism of my invention. is shown, and will be described in connection with a steam boiler and a steam'heating system associated therewith, I wish' it to be understood that the invention may be utilized in other analogous situations.

The invention is illustrated, in a preferred embodiment, in the accompanying drawing, wherein A l Fig. 1 shows the pumping mechanism, in elevation, associated with a steam boiler and radiator.

vabove the boiler water line.

Fig. 2 is a sectional view of the jet exhauster, and

Fig. 3 is a similar view of the device for riddiiig the circulatory conduit of air.

Referring to the drawing, 10 designates a steam boiler and 11 a steam condensing apparatus indicated, diagrammatically,- as a radiator of a heating system. 12 is the steam delivery pipe of the boiler, 13 the steam supply pipe leading therefrom-to the radiator, and 14 the return pipe of the radiator. The heating system indicated fragmentarily and diagrammatically in the drawing may be of the vacuum or low pressure type in which circulation of steam through radiator 11 is induced by suction on the return pipe 14, this pipe being shown as connected to a common return pipe 15.

The suction on the steam condensing apparatus (radiator 11 and the other radiators of the heating system) and the return of the condensate to the boiler is brought about by maintaining a continuous circulation of water through a circulatory conduit consisting of connecting pipes and receptacles; the circuit for the hurling water consisting, preferably, of a receptacle 16 and a conduit consisting of pipes 17 and 18, between which pipes is arranged a pump 19 which is shown as a pump of the centrifugal type, Pipe 17 leads from the bottom of receptacle 16 to the induction opening of the pump. Pipe 18 leads from the eduction opening of the pump into the top of receptacle 16, the end of the pipe projecting, preferably, down through the receptacle for some distance as indicated at 20 for the purpose of preventing water hammer which would be likely to occur if relatively cool water were allowed to come into contact with the steam Interposed in the eduction pipe 18 isa jet exhauster 21 of any'preferred construction. A suitable eXhauster is shown in detail in Fig. 2 and comprises a casing 22 secured by unions 23 to theends of the pipe sections 18, the casing having a neck 24 connected by union 25 with the return pipe 15 of the steam condensing apparatus. Projecting into casing 22 is a delivery nozzle 26 and a receiving nozzle 27 which are spaced apart. The action of the exhauster is to produce a suction in pipe 15 and the conduits communicating therewith which acts to draw into the hurling circuit the condensate and air and gases lus from the steam condensing apparatus. Associated with pipe 18 is a device 28 forallowing the escape of air and gases drawn into the hurling circuit while preventing the outflow of water. This device is arrangeduat a highpoint on the circuitoand consists, preferably, of a casing 29 Fig. 3) divided by a web 30 into two cham ers 31, 32 which communicate through openings 33, 34-in vthe web 30. 'Ilhe top of the casing is formed with an air port 35 adapted to be closed by' a valve 36 supported on a lever 37 pivoted tothe casing at 38 and connected by link 39 with a float 40 in chamber 32, the float being provided with a guide pin 41. passing through an opening 1n a web 42 formed on web 30. Fig. 3 shows the valve closed, the" float being raised by water in casing 29. Under normal conditions the valve 36 will be open to allow the escape of air fromthe hurling circuit. A water feed pipe 43 leads from the top of the recepfect, an.enlargement of'conduit 1 insure adequate water supply to the pump` tacle 16 into the boiler 10, preferably near.

the bottom of the boiler. This pipe may be provided with a valve 44. isa branch pipe leading from pipe 43 to the steam de- 12 of the boiler. The connec- Operation: With4 the pump driven by any suitable motor (not shown) water is drawn from receptacle 16 into the pump through pipe 17 and forced through pipe 18 into receptacle 16, the latter being?, 1n efand prevent water hammer as Vabove set forth. The Water is forced through the jet exhauste'r 21 at relatively high velocity, thereby producing the desired suction in pipe 15. The excess of water due to intro,- duction ofthe` condensate into the hurling circuit is forced through ipe 43 into the boiler. Pipe 45 provides or b alancingthe boiler steam pressure against the columns of water on opposite sides of pump 19 so as to preclude the possibility of syphoning act-ion whereby the boiler 'might be emptied of' water in case of failure of check valve 46 during a time that the pump was not in operation, and to' prevent boiler pressure,

from forcing waterl'through the air vent 35, while t-he pump is operating, in case the float valve should notl function properly.

'Preferablypipe 15 is provided with a l check valve 46 which opens in the direction toward the jet exhaustergthe purlpose of this ing up of Water from the hurling circuit into the steam condensing apparatus.

The invenion is illustrated in a practical but simple form of apparatus which, however, maybe considerably modified so far as' [details of construction are concerned,

the invention.

without departure from' the principles of duit and into said vessel therefrom, and a jet L exhauster arranged in saidconduit to produce a suction upon the Huid in said source of supply. 0

2. In combination, a source of supply of liquid, a vessel adaptedl to contain liquid under pressure, a circulatory conduit, a feed pipe' from the conduit to the vessel below the normal liquid level in the latter having a-branch pipe extending to said vessel above said normal liquid level, "a pump for forcing circulation of liquid through said con-4 duit, and a jet exhauster arranged in said conduit to produce a suction upone the .fluid in said source of supply of liquid.

3. In combination, a vessel adapted to contam liquid under gas pressure, a source of liquid su'pply, and means for withdrawing o liquid from the source of supply and introducing same into the vessel comprising a liquid pump subject on both sidesto the gas pressure existing in the vessel, and a jet 3 exhauster.

4. In combination, a vessel adapted to contain liquid under gas pressure, a source of liquid supply, and means for withdrawing liquid from the source of supply and introducing same into the vessel comprising a hurling liquid circuit under the gas pressure existing in the vessel, and including a pump and a Jet exhauster. i A.

` 5. In combination with a source of supply of, fluids, and a vessel adapted to contain liquid under gas pressure, al liquid receptacle, a feed pipe leading from the receptacle to the .vessel below ythe normal liquid level in the vessel, and a branch pipe communicatingv -with the vessel above the normal liquid level,

a hurling liquid conduit, one `end of which leads from the bottom of the receptacle and the other end of which extends downwardly through the receptacle from the top, a pump interposed in said conduit, and a, jet exhauster in the conduit arranged to iexert a suction on the fluid in the source of supply.

6. In combination with a .source of fluid supply, and a vessel adapted to contain liq- Auid under gas pressure, a liquid receptacle,

a feed -pipe leading from the receptacle to the vessel below the normal liquid level therein, abranch pipe communicating with the vessel above the normal liquid level therein, a hurling li uid conduit, one end of which leads from t e bottom of the receptacle and the other end of which ext-ends downwardly I through the receptacle from the top, a pump part with a Y vent for gases,

` of fluids,

v for liquid having avent with an outwardly.

interposed vin said conduit, a jet exhauster arranged in said conduit on the eduction side of the pump to exert suction on the fluid in the source of supply, a check valve opening toward the jet exliauster between the same and the source of fluid supply, said circulatory conduit being provided in the upper gas vent, and a float operated valve controlling said vent.

7. 1n combination with a source' of fluid supply, and a vessel adapted to contain liquid under gas pressure, a hurling liquid conduit, a pump interposed in said conduit, a jet exhauster in said conduit arranged to produce a partial vacuum in the source of vfluid supply, and'connections between the hurling liquid conduit and the vessel whereby bothv sides of the pump will be under the as pressure existing in the vessel, and the iluid drawn into the hurling conduit will be fed to the vessel.

8. In combination with a source of supply of iluids, a vessel under pressure, a receiver for liquid, means cuit, a conduit between the source of supply of-luids and the hurling circuit, an impeller to force liquid through said circuit, a pipe connecting the lower portion of the receiver with the hurling circuit, a pipe connection between the hurling circuit andvessel above and below the liquid level therein, a separat-4 ing tank in said hurling circuit having a and a float controlled valve adapted to close said vent.

9. In combination with a source of supply a vessel ,under pressure, a receiver opening check valve, means constituting a hurling circuit, a conduit between the source of supply of fluids and the hurling circuit, animpeller to force liquid through said cir- ',cuit, a pipe connecting the lower portion of the receiver with the hurl-ing circuit, and a pipe connection betweeny the hurling circuit and vessel above and below the liquid level therein.

10. ln combination with a source of supply of fluids, a vessel under pressure, a receiver for liquid having a vent with an outwardly opening check valve, means constituting a hurling circuit, a conduit between the source of supply of fluids and the hurling circuit, an impeller to force liquid through said circuit, a pipe connecting the lower portion of constituting a hurling ciri the receiver with the hurling circuit and provided with a check valve opening toward the latter, and a ypipe connection between the hurling circuit and vessel above and below the liquid level therein.

11. In combination with a source of supply of fluids, a vessel for liquid under gas pressure, means constituting a hurling circuit, a jet eXha-uster and an impeller in said circuit, a conduit connecting the source of supply of fluids with the jet exhauster and means for connecting the hurling circuit with said vessel both below and'above the liquid level therein:

12. In combination with a source of supply of fluids, pressure, means constituting a hurling circuit, a jet exhauster and an impeller in .said circuit, a conduit connecting the source of supply of fluids with the jet exhauster, means for connecting the hurling circuit with saidl vessel both below and above the liquid level therein and means arranged' above and in communication with the hurling circuit for eliminating gas therefrom.

13. In combination with a source of supply of fluids, a vessel for liquids under gas pressure, means constituting a hurling Vcircuit comprising a receptacle and pipes connected with the top and bottom of said receptacle, an impeller and a j-'et exhauster in the hurling circuit, a conduit connecting the source of supply of fluids with ,said jet exhauster, and a conduit leading from the receptacle having vbranches to said vessel above and below the liquid level therein whereby the liquid levels in the vessel and receptacle will equalize.

14. ln combination with a source of supply of fluids, a vessel for liquids under gas pressure, means constituting a hurling circuit comprising a receptacle and pipes connected with the top and bottom ot said receptacle, an impe-ller and ajet exhauster in the hurling circuit, a conduit connecting the source of supply of fluids with said jet exhauster, a conduit leading from the receptacle having branches to said vessel above and below the liquid level therein whereby the liquid levels in the vessel and receptacle will equalize and. means arranged above and l CLAYTON A. DUNHAM. 

